Process or method of casting



Dec., 12, 1933. L Q w, MANN 1,938,707

PROCESS OR METHOD OF CASTING Filed July 28, 1930 IIIII l To? 27@ Mani/ay ATTO R N EY Patented Dec. 12, 1933 UNITED STATES PATENT OFFICE MotorCat Company, poration of Michigan Lansing, Mich.. a col'- ApplcationJuly 28, 1930. Serial No. 471,325

1 Claim.

This invention relates to a cast metal plate having a pin of differentmaterial cast thereinand to the process or method of casting the same. l

The invention relates particularly to a cast iron punch plate having asteel pilot pin cast therein and to the method of making the same.

Heretofore it has been the custom to employ in connection with punchpresses and the like, a

1 punch plate formed of cast iron or the like having formed thereon anintegral cast projection or pin by means of which the plate is securedto the press. It has been found in practice, however, that cast ironpins or projections cast with the plate when the same ismade are apt tofracture and frequently do at the juncture of the pin with the plate.

It is therefore one of the important objects of my invention to providea punch plate having zo a steel pin secured thereto when the plate iscast, it being found that in structures of this kind all liability offracture at the juncture of the plate and pin is eliminated.

The several objects and advantages of my invention together with themanner in which my improved method or process is practiced will be mademore apparent as this description proceeds, especially when consideredin connection with the accompanying drawing, wherein Figure 1 is aperspective view of a punch plate constructed in accordance with myinvention and in accordance with my process;

Figure 2 is a vertical sectional view through a mold by means of whichthe plate is cast, and

g5 Figure 3 is a top plan view of the core of the mold.

As seen from Figure 1, the punch plate 10 is cast with a pilot or pin11, formed preferably of steel and united with the plate 10 when thelatter o is cast.

By reference to Figures 2 and 3the manner in which the punch plate 10 iscast will be made more apparent. In this iigure it will be noted thatthe mold consists of a drag section 12 and I5 a cope section 13. Thedrag section of the mold is provided with the punch plate pattern recessor cavity 14. The drag section of the mold is preferably rammed full ofsand with the bottom side up, the sand being rammed around the 0 punchplate pattern (not shown) which would then be in the bottom thereof. Thedrag section of the mold is then turned over placing the pattern on top.

The reference character 15 indicates the core 5 of the mold which asshown in Figure 3, is formed of two sections 15'. The two halves of thecore are recessed to accommodate the end of the pilot or pin 16 andafter being placed together these two core halves are cemented togetherto thus hold the pilot or pin in place.` The core is proso vided with aplurality of vertically extending apertures 17 arrangedcircumferentially around the pilot 16.

The core together with the pilot 16, is placed in the cope section ofthe mold and for locating the pilot with respect to the mold cavityduring the time that sand is rammed into the cope section of the mold,the punch plate pattern which is still in the drag section of the moldis provided with an aperture 18, see the dotted line illustration of aportion of the punch plate pattern shown in Figure 2.

Therefore with the core in position and with the pilot 16 extending downinto the aperture 18, sand is rammed around the core rmly to hold thecore in the position shown. At the same time a riser (not shown) isinserted in the upper ask to provide the riser opening 19.

After the cope section has been rammed full of sand it is removed on theparting line, the pattern is taken out together with the member whichformed the riser opening and an outlet is made communicating with theriser opening. Thereafter the cope section is again placed on the dragsection of the mold whereupon the pilot or pin 16 will project down intothe pattern recess or cavity 14. Thereafter a runner box 20 is placed ontop of the cope section of the mold in position to surround the core 15.Also an over-flow basin 2l is placed at the side of the mold adjacentthe riser and the molding apparatus is ready for the-.pouring of themolten metal. A

At this point it might be noted that the pilot or pin 16 is preferablymade of cold-rolled steel and copper plated. In the flrst place, thisprevents rusting of the pilot and the copper serves as a flux to insurean adequate union between the pilot and the cast iron of which the punchplate is formed.

The metal is then poured into the runner box in suiiicient quantitiesand fast enough to keep the runner box substantially completely full,thus creating a static head or pressure which acts to force the moltenmetal down through the circumferentially arranged apertures 17 and into105 the mold cavity 14. After the mold cavity 14 is full, the metaloverows through the riser and flows into the over-now basin 21.

In practice it has been found eicient to pour into the mold a surplus ofmetal substantially 110 equal to the amount required to illl the patternrecess or cavity 14. This surplus of hot molten metal which ows throughthe apertures 17 and into the pattern recess heats the pilot or pin 16substantially to a melting point which causes the pilot and the plate tounite. By reason of the fact that the pilot becomes thoroughly heatedthroughout its length, it does not cool quicker than or prior to theplate'lO so that there is no difference in the coefficient of expansionor contraction which would permit the pilot 16 to become loose withrespect to the plate. Moreover, it is desirable, although not essential,that the end of the pilot 16 be provided with a circumferential grooveor reduced portion 16' into which the molten metal will flow to providea more adequate union between the parts. In practice it also has beenfound that by maintaining the pin heated throughout its length it willnot chill and harden the cast iron and prevent machini118.

When the cast article has become suiiiciently chilled to be removed fromthe mold, the core 15 is obviously removed from the pilot 16.

Various modicatons of the specic method herein described may suggestthemselves to those skilled in this art and to this end reservation ismade to make such changes as may come Within the purview of theaccompanying claim.

What I claim as my invention is:

Those steps in the method of integrating a steel pilot with a cast ironpunch plate which consist in forming a cavity in a lower mold part, saidcavity being of the size and shape of the punch desired, mounting apilot in a core member with the end of the pilot projecting from thecore member, mounting said core member in a second mold part, assemblingsaid second mold part with the first mentioned mold part with theprojecting end of the pilot disposed in the cavity in the rst mentionedmold part, forming passages in the core member circumferentially of thepilot, and pouring molten casting metal into said cavity by way of saidpassages.

IRA C. W. MANN.

